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diff --git a/include/cppuhelper/implbase.hxx b/include/cppuhelper/implbase.hxx
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This file is part of the LibreOffice project.
+ *
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ *
+ * This file incorporates work covered by the following license notice:
+ *
+ *   Licensed to the Apache Software Foundation (ASF) under one or more
+ *   contributor license agreements. See the NOTICE file distributed
+ *   with this work for additional information regarding copyright
+ *   ownership. The ASF licenses this file to you under the Apache
+ *   License, Version 2.0 (the "License"); you may not use this file
+ *   except in compliance with the License. You may obtain a copy of
+ *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
+ */
+
+#ifndef INCLUDED_CPPUHELPER_IMPLBASE_HXX
+#define INCLUDED_CPPUHELPER_IMPLBASE_HXX
+
+#include "sal/config.h"
+
+#include <cstddef>
+#include <utility>
+
+#include "com/sun/star/lang/XTypeProvider.hpp"
+#include "com/sun/star/uno/Any.h"
+#include "com/sun/star/uno/Sequence.hxx"
+#include "com/sun/star/uno/Type.h"
+#include "cppuhelper/implbase_ex.hxx"
+#include "cppuhelper/weak.hxx"
+#include "rtl/instance.hxx"
+#include "sal/types.h"
+
+#if defined LIBO_INTERNAL_ONLY
+
+// A replacement for ImplHelperN has deliberately been left out, as ImplHelperN
+// is unlikely ever be a better choice than WeakImplHelper, so all their
+// existing uses are probably confused and should use WeakImplHelper instead.
+//
+// Replacements for WeakAggImplHelperN and AggImplInheritanceHelper1 have
+// deliberately been left out, as the underlying aggregation mechanism is known
+// broken in general and should not be used.
+
+namespace cppu {
+
+/// @cond INTERNAL
+
+namespace detail {
+
+template<std::size_t N> struct class_dataN {
+    sal_Int16 m_nTypes;
+    sal_Bool m_storedTypeRefs;
+    sal_Bool m_storedId;
+    sal_Int8 m_id[16];
+    type_entry m_typeEntries[N + 1];
+};
+
+template<typename Impl, typename... Ifc> struct ImplClassData {
+    class_data * operator ()() {
+        static class_dataN<sizeof... (Ifc)> s_cd = {
+            sizeof... (Ifc) + 1, false, false, {},
+            {
+                { { Ifc::static_type },
+                  (reinterpret_cast<sal_IntPtr>(
+                      static_cast<Ifc *>(reinterpret_cast<Impl *>(16)))
+                   - 16)
+                }...,
+                CPPUHELPER_DETAIL_TYPEENTRY(css::lang::XTypeProvider)
+            }
+        };
+        return reinterpret_cast<class_data *>(&s_cd);
+    }
+};
+
+}
+
+/// @endcond
+
+/** Implementation helper implementing interfaces
+    css::uno::XInterface, css::lang::XTypeProvider, and
+    css::uno::XWeak (through cppu::OWeakObject).
+
+    @derive
+    Inherit from this class giving your interface(s) to be implemented as
+    template argument(s).
+*/
+template<typename... Ifc>
+class SAL_NO_VTABLE SAL_DLLPUBLIC_TEMPLATE WeakImplHelper:
+    public OWeakObject, public css::lang::XTypeProvider, public Ifc...
+{
+    struct cd:
+        rtl::StaticAggregate<
+            class_data, detail::ImplClassData<WeakImplHelper, Ifc...>>
+    {};
+
+protected:
+    WeakImplHelper() {}
+
+    virtual ~WeakImplHelper() override {}
+
+public:
+    WeakImplHelper(WeakImplHelper const &) = default;
+    WeakImplHelper(WeakImplHelper &&) = default;
+    WeakImplHelper & operator =(WeakImplHelper const &) = default;
+    WeakImplHelper & operator =(WeakImplHelper &&) = default;
+
+    css::uno::Any SAL_CALL queryInterface(css::uno::Type const & aType) override
+    { return WeakImplHelper_query(aType, cd::get(), this, this); }
+
+    void SAL_CALL acquire() throw () override { OWeakObject::acquire(); }
+
+    void SAL_CALL release() throw () override { OWeakObject::release(); }
+
+    css::uno::Sequence<css::uno::Type> SAL_CALL getTypes() override
+    { return WeakImplHelper_getTypes(cd::get()); }
+
+    css::uno::Sequence<sal_Int8> SAL_CALL getImplementationId() override
+    { return css::uno::Sequence<sal_Int8>(); }
+};
+
+/** Implementation helper implementing interfaces
+    css::uno::XInterface and css::lang::XTypeProvider
+    inheriting from a BaseClass.
+
+    All acquire() and release() calls are delegated to the BaseClass.  Upon
+    queryInterface(), if a demanded interface is not supported by this class
+    directly, the request is delegated to the BaseClass.
+
+    @attention
+    The BaseClass has to be complete in the sense that
+    css::uno::XInterface and css::lang::XTypeProvider are
+    implemented properly.
+
+    @derive
+    Inherit from this class giving your additional interface(s) to be
+    implemented as template argument(s).
+*/
+template<typename BaseClass, typename... Ifc>
+class SAL_NO_VTABLE SAL_DLLPUBLIC_TEMPLATE ImplInheritanceHelper:
+    public BaseClass, public Ifc...
+{
+    struct cd:
+        rtl::StaticAggregate<
+            class_data, detail::ImplClassData<ImplInheritanceHelper, Ifc...>>
+    {};
+
+protected:
+    template<typename... Arg> ImplInheritanceHelper(Arg &&... arg):
+        BaseClass(std::forward<Arg>(arg)...)
+    {}
+
+    virtual ~ImplInheritanceHelper() {}
+
+public:
+    ImplInheritanceHelper(ImplInheritanceHelper const &) = default;
+    ImplInheritanceHelper(ImplInheritanceHelper &&) = default;
+    ImplInheritanceHelper & operator =(ImplInheritanceHelper const &) = default;
+    ImplInheritanceHelper & operator =(ImplInheritanceHelper &&) = default;
+
+    css::uno::Any SAL_CALL queryInterface(css::uno::Type const & aType) override
+    {
+        css::uno::Any ret(ImplHelper_queryNoXInterface(aType, cd::get(), this));
+        return ret.hasValue() ? ret : BaseClass::queryInterface(aType);
+    }
+
+    void SAL_CALL acquire() throw () override { BaseClass::acquire(); }
+
+    void SAL_CALL release() throw () override { BaseClass::release(); }
+
+    css::uno::Sequence<css::uno::Type> SAL_CALL getTypes() override
+    { return ImplInhHelper_getTypes(cd::get(), BaseClass::getTypes()); }
+
+    css::uno::Sequence<sal_Int8> SAL_CALL getImplementationId() override
+    { return css::uno::Sequence<sal_Int8>(); }
+};
+
+}
+
+#endif
+
+#endif
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */